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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Contemporary Mathematics. Fundamental Directions</journal-id><journal-title-group><journal-title xml:lang="en">Contemporary Mathematics. Fundamental Directions</journal-title><trans-title-group xml:lang="ru"><trans-title>Современная математика. Фундаментальные направления</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2413-3639</issn><issn publication-format="electronic">2949-0618</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">28866</article-id><article-id pub-id-type="doi">10.22363/2413-3639-2021-67-2-285-294</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Stochastic Lagrange Approach to Viscous Hydrodynamics</article-title><trans-title-group xml:lang="ru"><trans-title>Стохастический лагранжев подход к вязкой гидродинамике</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gliklikh</surname><given-names>Yu. E.</given-names></name><name xml:lang="ru"><surname>Гликлих</surname><given-names>Ю. Е.</given-names></name></name-alternatives><email>yeg@math.vsu.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Voronezh State University</institution></aff><aff><institution xml:lang="ru">Воронежский государственный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2021-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2021</year></pub-date><volume>67</volume><issue>2</issue><issue-title xml:lang="en">Dedicated to the memory of Professor N. D. Kopachevsky</issue-title><issue-title xml:lang="ru">Посвящается памяти профессора Н. Д. Копачевского</issue-title><fpage>285</fpage><lpage>294</lpage><history><date date-type="received" iso-8601-date="2021-10-23"><day>23</day><month>10</month><year>2021</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2021, Contemporary Mathematics. Fundamental Directions</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2021, Современная математика. Фундаментальные направления</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="en">Contemporary Mathematics. Fundamental Directions</copyright-holder><copyright-holder xml:lang="ru">Современная математика. Фундаментальные направления</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc-nd/4.0/deed.en</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/CMFD/article/view/28866">https://journals.rudn.ru/CMFD/article/view/28866</self-uri><abstract xml:lang="en"><p style="text-align: justify;">The work is a survey of the author’s results with modifications and preliminary information on the use of stochastic analysis on Sobolev groups of diffeomorphisms of a flat n-dimensional torus to describe the motion of viscous fluids (nonrandom ones). The main idea is to replace the covariant derivatives on the groups of diffeomorphisms in the equations introduced by D. Ebin and J. Marsden to describe ideal fluids by the so-called mean derivatives of random processes.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">Работа представляет собой обзор результатов автора с модификациями и предварительными сведениями по использованию стохастического анализа на соболевских группах диффеоморфизмов плоского n-мерного тора для описания движения вязких жидкостей (неслучайных). Основная идея состоит в замене ковариантных производных на группах диффеоморфизмов в уравнениях, введенных Д. Эбином и Дж. Марсденом для описания идеальных жидкостей, на так называемые производные в среднем случайных процессов.</p></trans-abstract><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Партасарати К. Введение в теорию вероятностей и теорию меры. - М.: Мир, 1988.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Arnol’d V. 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